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Title: Initial results of the Geosynchronous Synthetic Thinned Array Radiometer (GeoSTAR)
Authors: Tanner, Alan B.
Wilson, W. J.
Lambrigsten, B. H.
Dinardo, S. J.
Brown, S. T.
Kangaslahti, P.
Gaier, T. C.
Ruf, C. S.
Gross, S. M.
Lim, B. H.
Musko, S.
Rogacki, S.
Keywords: microwave radiometers
Synthetic Thinned Aperture Radiometer (STAR)
aperture synthesis
remote sensing
Issue Date: 26-Jul-2006
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2006.
Citation: IEEE GeoScience and Remote Sensing Symposium, Denver, Colorado, July 26 - August 4, 2006.
Abstract: An error budget is presented to meet 1 Kelvin radiometric accuracy in a geostationary atmospheric sounder with 50 km spatial resolution on the earth. The gain and phase errors are weighted by the magnitude of visibility versus antenna separation, and requirements range between ~0.5% and 0.3 degrees of amplitude and phase, respectively, for the closest spacings at the center of the array, and about 5% and 3 degrees for the majority of the array. The latter requirement is met by our design without any special testing or stabilizations by reference signals. The former is met using an internal noise diode reference and by measuring the detailed antenna patterns on the antenna range. Biases and other additive errors in the raw visibility samples must be below about 2 mK on average, and this requirement is met by a phase shifting scheme applied to the local oscillator distribution. An outline of the data processing is presented, along with the first images from this system.
Appears in Collections:JPL TRS 1992+

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